Electric-arc lamp.



J. H. HALLBERG.

ELECTRIC ARO LAMP. APPLICATION FILED JUNE 22, 1908.

Patented June 13, 1911.

A ttest:

UNITED STATE PATENT OFFICE.

JOSEF H. HAIALBERG', OF NEW YORK, N. Y., ASSIGNOR TO THE BECK FLADIINGLAMP COMPANY, OF CANTON, NEW YORK, A CORPORATION OF NEIV YORK.

ELECTRIC-ARC LAMP.

Specification of Letters Patent.

Patented June 13, 1911.

Application filed. June 22 1908. Serial No. 439,686.

To all whom it may concern:

Be it known that I, Josnr I-I. HALLBERG, a citizen of the United States,and resident of New York, in the county and State of New York, haveinvented certain new and useful Improvements in Electric-Arc Lamps, ofwhich the following is a specification.

My invention relates to electric arc lamps and its novelty consists inthe construction and adaptation of the parts as will be more fullyhereinafter pointed out, and specifically to the means employed forlimiting and controlling the movement of one or both electrodes wherebythe automatic extinguishment of the lamp is secured at proper orpredetermined times.

In an application for Letters Patent of the United States filed by me onthe 13th day of June, 1908, Serial No. 138,277, I have described a novelform of lamp comprising two electrodes, one supported from the other,and means adapted normally-to bring their points into contact when thelamp is not energized, including an obliquely placed holder for thesupported electrodes, and means whereby the electrodes are automaticallybrought to a vertical parallel position and their points separated aproper distance when the lamp is energlzed.

I take advantage of the form of electrode holders employed in themechanism described in that case for the purpose of controlling the timeof extinguishing the lamp, and limiting the period of its combustion, inthe manner hereinafter stated.

In the drawings, Figure 1 is a side elevation of the lower portion of anelectric arc lamp, the base of the lamp being shown in vertical section;and Fig. 2 is a view of the same parts in a difierent position.

In the drawings 2 is the base of the lamp provided with a transverseplate 20 of insulating material, for instance steatite. This plate isformed with apertures 21 and 22 through which the electrodes 80 and 31extend into the combustion chamber formed by the base 2 and said plate.Hinged to an upwardly extending bracket or other suitable device 6%carried by this plate is a rod 64 adapted to serve as a guide andsupport for one of the electrode holders, which comprises a slittedsleeve 71 having a projection 72 which is slidably mounted on the rod64;, and a rod 70 which rises from it and is provided with one or morerollers 74. The electrode 30 is mounted in this sleeve. The holder forthe other electrode 31 similarly consists, preferably, of a slit-tedtube 81 supported and guided by means similar to those for like purposedisclosed in my application hereinbefore referred to, and for thisreason it is not necessary to set them forth in detail herein. It isconsidered to be suflicient to state that the tube 81 depends from aplate 6 which moves between and is guided by the frame-uprights, one ofwhich is shown at 3. This plate also has a laterally extendinglongitudinal slotted bracket 62. The rods (34; and 70 extend through theslot in this bracket and are moved together back and forth therein toadjust the electrode 30 into and out of parallel relation with theelectrode 31. The wheels 74 traverse the upper surface of the bracket insuch movement of the rods. Thus far the structure is like thatillustrated and described in my before-mentioned application by way ofexample of structures to which my present improvements are applicable.

Arranged at the arcing end of the electrode 31 and engaging the ribthereof is a support 250 therefor. This support is in the form of afoot, here shown as arranged at the lower end of a carrier 25, suspendedfrom a ring 26 by pins 262 seated in apertures 261 in the ring. Inpractice this carrier is preferably a sleeve through which extends a rodwhich is suitably attached thereto, said rod extending from the foot,all as in my previous construction hereinbefore referred to. I do notconsider it necessary to show this detail herein as it is not essentialto the present invention. In the present illustrated form of the devicethe support is adjusted laterally by a set screw 257 having a threadedengagement with the base and provided with an insulated tip to engagethe carrier 25.

At the upper end of the carrier is an upwardly extending arm serving forinstance, as fully disclosed in my application No. 439,897 as a meansfor conveying thereto current to energize the support and also tendingto hold the support in one position.

The rod 64 is graduated and is provided with a slidable ring 640 havinga set screw 641 by which it may be secured at any place along the rod.

As explained in the application above referred to, the electrode 30before the lamp is energized, is swung into an oblique position byreason of the engagement of its holder with the rod 64:, and the lowerpoint of the electrode 30 is in contact with the lower point of theelectrode 81. When the lamp is energized the rod 64 is swung on itspivot and the holder of the electrode 30 is brought to a verticalposition parallel with the holder of the other electrode, and theelectrodes 30 and 31 are brought to a substantially vertical parallelposition with their lower points properly spaced apart.

Let us suppose that the sleeve 71 is located nearer to a detainingelement therefor (as the plate 20, for example) than the sleeve 81, asindicated in Fig. 1. As the electrodes burn they descend and finallyreach a point where the lower end of the sleeve 71 contacts with theupper part of the plate 20. As the electrode 30 is unable to movedownward any longer it burns away at its lower end and the are graduallylengthens as indicated in Fig 1 until finally it goes out. It is thusobvious that by vary ing the distance of the sleeves 71 and 81 from adetaining element the time of extinguishing the lamp could be thusapproximately predicted. But I have designed a more certain method ofcontrolling the matter, which comprises the before referred to ring 6 10adjustably fixed in the path of downward movementof the projection 72from the tube 71. The slip ring 640 may be arranged at any point alongthe rod 6 1. lVherever it is placed, when the projection 72 contactstherewith the descent of the latter is interrupted as shown in Fig. 2and the electrode 30 burns away until the distance between the ends ofthe electrodes becomes so great that the are is extinguished.

The graduations on the rod 641 may be noted in terms of hours andfractions thereof and by adjusting the slip ring 6 10 at a point soindicated the lamp can be made to extinguish itself without any furtherattention.

If as a result of the energizing of the support, the arc continues toburn for a short time after movement of the electrode 30 has ceased, atime will come when it will burn away from the foot 250 and form an arebetween the electrode and said foot in addition to the are between thetwo electrodes, thus causing the extinction of the lamp in a shortertime than if the gradual lengthening of the are between the twoelectrodes was alone relied upon. By adjusting the foot 250 to and fromthis electrode the extinguishing action can be made more delicate andslower or more rapid as the case may be and therefore increases thecertainty of the automatic action of the lamp in ex tinguishing itselfat the proper time.

What I claim is:

1. In an electric arc lamp, a movable electrode, a second electrode,means whereby the second electrode is supported by the one firstmentioned, adapted to permit feeding movement of the latter relative tothe second electrode, and a detaining means for the second electrode,mounted in the path of movement thereof in position to restrain itsmovement with the first mentioned electrode before the cessation offeeding movement of the latter.

2. In an electric arc lamp, a movable electrode, a second electrode,means whereby the sccon d electrode is supported by the one firstmentioned, adapted to permit feeding movement of the latter relative tothe second electrode, and a detaining element for the second electrode,adjustably mounted in the path of movement thereof to restrain itsmovement with the first mentioned electrode before the cessation of thefeeding movement of the latter.

3. In an electric arc lamp, a first electrode and a second electrodearranged for feeding movement in substantially the same direction, asupport for the first electrode, means for connecting the electrodeswith each other, adapted to support the second electrode from the firstelectrode for movement simultaneously and to permit the first electrodeto move relatively to the second electrode when movement of the latteris restrained, said means comprising interengaging elements respectivelyextending from the electrodes and loosely engaging with each other, theelement from the second electrode being supported by the element fromthe first electrode, and means for restraining movement of the secondelectrode at a predetermined time.

1. In an electric arc lamp, a first electrode and a second electrodearranged for feeding movement in substantially the same direction, asupport for the first electrode, means for connecting the electrodeswith each other, adapted to support the second electrode from the firstelect-rode for move ment simultaneously and to permit the firstelectrode to move relatively to the second electrode when movement ofthe latter is restrained, said means comprising interengaging elementsrespectively extending from the electrodes and loosely engaging witheach other, the element from the second electrode being supported by theelement from the first electrode, a graduated member, a projection fromthe second electrode, and a stop adjustably mounted on said member, inthe path of said projection and act ing thereon to restrain movement ofthe second electrode.

5. In an electric arc lamp, a first and a second electrode, movable insubstantially the same direction, holding members at one end of eachthereof, a supporting means at the arcing end of the first electrode,means carried by the holding members for connecting the electrodes forsimultaneous movement, said means being adapted to support the secondelectrode from the first electrode and to be disconnected from eachother by restraining the movement of the second electrode and to permitthe first electrode then to move relatively to the other, and adjustablemeans for restraining the movement of the second electrode at apredetermined time.

6. In an electric arc lamp, a first and a second electrode movable insubstantially the same direction, holding members at one end of eachthereof, a supporting means at the arcing end of the first electrode,means carried by the holding members for connecting the electrodes forsimultaneous movement, comprising means extending from the holdingmembers respectively and so related to each other that the means of theholding member of the second electrode will be supported by the means ofthe holding member of the first electrode and will be disconnected fromthe latter by restraining the movement of the second electrode, aprojection from the holder of the latter electrode, and adjustable meansarranged in the path of said projection for restraining the movement ofthe second electrode at a predetermined time.

7. In an arc lamp, whose electrodes are movable in substantially thesame direction, holding members respectively connected to theelectrodes, and provided with interengaging elements adapted to supportone elec trode from the other for movement simultaneously and to bedisconnected from each other when the movement of the supportedelectrode is restrained before movement of the other electrode ceases,the latter electrode being movable relatively to the other, and meansfor restraining movement of the supported electrode.

8. In an arc lamp, whose electrodes are movable in substantially thesame direction,

holding members respectively connected to the electrodes, and providedwith interengaging elements adapted to support one electrode from theother for movement simultaneously and to be disconnected from each otherwhen the movement of the supported electrode is restrainedbeforemovement of the other electrode ceases, the latter electrode beingmovable relatively to the other, a projection from the supportedelectrode, a graduated member, and a stop adjustably mounted on thegraduated member in the path of said projection.

9. In an arc lamp, an electrode, a support therefor arranged at thearcing end thereof, a second electrode mounted to have movement into andout of substantially parallel relation with the first electrode, aholder for the second electrode having a projection, a swinging memberslidably engaged by said projection, a stop adjustably mounted on saidmember in the path of movement of said projection, for restrainingmovement of the second electrode, a holder for the firstmentionedelectrode, guiding means with which the same is slidably engaged, andmeans for supporting the second electrode from the first-mentionedelectrode adapted topermit feeding movement of the first-mentionedelectrode relatively to the second electrode when feeding movement ofthe latter has been restrained, comprising an element extendinglaterally with relation to the holder of the first-mentioned electrodeand an element connected with the holder of the second electrode andresting upon said laterally extending element and movable with relationthereto.

Witness my hand this 18th day of June 1908, at New York, N. Y.

J OSEF H. HALLBERG. Witnesses:

WILLIAM R. BAIRD, ALAN C. MCDONNELL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

